Hot-blast pyrometer



(N0 Model.)

. E. BROWN.

HUT BLAST PYROMETER.

N0. 247,240. Patented Sept. 20,1881.

. UNITED STATES PATENT OFFICE.

EDWARD BROWN, OF PHILADELPHIA, PENNSYLVANIA.

HOT-BLAST PYROM ETE R.

SPEOIFIGA'IION forming part of Letters Patent N0. 247,240, dated September 20, 1881.

Application filed March 19, 1881.

T0 all whom it may concern:

Be i1; kuowu that I, EDWARD BROWN, of 311 Waluut Street, Philadelphia, Peuusylvauia, have inveuted a new aud useful Hot-Blast Pyrometer- Fitting, of which the f'ollowiug is a specificatiou.

My iuveutiou cousists in a brauch pipe 0r nozzle fitted to the bot-blast maiu und 0pen to the bot-blast. Upou this pipe are two valves, oue ab the bottom, the cther at the top. The Iower 0ue is conuected with the cold-bla st xuaiu pipe, the upper oue opeus t0 the atmosphere.

These valves are adjustable in relatiou t0 each other, so that the hot and cold blast may,

be mixed in certaiu definite proportious. The cold blast or air passes through a water-tauk to maintaiu the blast ab a certaiu fixed temperature.

The figure is a vertical section through the apparatus, the valves aud r0d being shcwu in elevatiou.

A is the bot-blast maiu, lined with fire-brick.

B is a brauch pipe closed at the t0p eud, aud secured ab its lower eud to the bot-blast main hy the saddle O. This brauch pipe has au outside ease, b, aud is 0peu ab the bottom t0 the bot-blast. 'lhe lower valve, D, commuuicates by pipe d with the cold-blast main from the eugine. 'lhe upper valve, E, discharges the mixed hob aud cold blast iut0 the atmosphere.

H is the ordiuary Gauutlett pyrorueter, having its usual dial aud atubular Stern, h, inclosiug a rod of a differeut metal. The haudles e and d of the valves are joiuted with pius t0 the upright r0d K. The 10wer piu has ou it a thumb-sc1*ew, d by which it cau be adjusted in the slot k. The air from the atmosphere orfrom the cold-blastmain passes through a c0il, M, in the water-tauk N, by which the c0ld air ruay be kept a a fixed temperature wheu indicatiug the temperature of the hotblast.

Adj ust the valves in this wa y Start the pyrometer at 0 Fahrenheit before insertiug it; in the brauch B. Let the bot blast be .at sonne temperature which will u0t iujure the stelu h open the valve E wide 110 the stop e and we will assume the pyrometer shows 900 actual (N0 model.)

temperature of blast; then open valve D aud admit cold-blast until the pyrometer shows 600, or oue-third less thau the true temperature, aud tighteu the thumbscrew d in its positiou in the slot 7c. The instrurueut is now ready f0r use. 'lhe handle S being raised, the poiuterof the pyrometer will always show two-thirds of the correct temperature. In place cf the pyrou1eterH ruy portable 'pyroxueter may be used. ab the outlet 0f valvc E. This plan obviates any error from a varying pressure 0f the hotb1ast, as the pressnre of the bot aud 001d blast remaius relatively the same. II: also obviates error from the varyiug temperature cf the atmosphere.

I claiml. The combination, in a bot-blast p yrometer-fittiug, cf a bot-blast maiu, a brauch pipe secured thereto, a va1ve couuccting with the iuterior of the brauch pipe am]. opeuiug t0 the atmosphere, a second valve, also commuuieating with the iuterior cf the brauch pipe aud couuectiug with the cold-air main, and means for sixuultaueously operatiug both valves aud ad justing the secoud.valve, whereby the adruission of cold air aud the proportious of bot aud cold air are accurately adjusted, substantially as und for the purposes sei: forth.

2. In a h0tblast pyrometerfittiug, a hotblast maiu, a brauch pipe secured thereto, a valve conuectiug with theinterior 0f the brauch pipe and opeuiu g t0 the atmosphere, aud a secoud valve, also commuuicatiug with the interior of the brauch pipe aud couuectiug with the cold-air maiu, combined with meaus for simultaueously operating both valves and adjustiug the second valve, aud with a watertauk, through which the cold-air pipe passes, whereby both the quantity ot' the 001d air admitted, the proportions cf the h0t aud cold air mixed, aud the temperature 0f the 001d air are adjusted aud regulated, substautially as aud for the purposes Set forth.

EDWARD BROWJQT.

Wituesses:

PARK MFARLAND, J r., JOHN F. GRANT 

